The principal of private Brisbane school Hubbards says it is in limbo due to the Queensland Government's failure to clarify its position on senior external exams.

Principal Helen Stevens says the Liberal National Party (LNP) convention last week voted unanimously to reverse a decision to scrap the tests from 2015.

The Queensland Studies Authority made the decision last year to stop doing the tests.

Ms Stevens says the indecision is causing great stress as external exams are the only program used at school.

"If we do take on another program in 2015, which is the projected final year of external senior exams, we will actually have to run two programs - the existing one - and whatever the new program is," she said.

"That means we have double the teaching expenses and the school can't really afford that."

However, Education Minister John-Paul Langbroek says he is going against LNP wishes and has confirmed the Government will scrap external senior school exams from the end of 2015.

Mr Langbroek insists it is not the best method of assessment.

"Hubbards have been unwilling to accept the decision and it's been raised with me in a number of forums publicly and privately," he said.

"I've indicated via my office that of course we want to work with them - they've all been accepting of the decision - it's only Hubbards which is resisting.

"While we want to work with them, it's a decision which has been taken by the experts and one I'm prepared to abide by."